Shelter



FIG. 1 is a perspective view of a shelter in accordance with my invention;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top view thereof; and

FIG. 5 is a perspective view of an alternative embodiment thereof. 

The ornamental design for a shelter, substantially as shown and described. 